Bitcoin is still over 90% of the market cap for all crypto-currencies... let's start the discussion again when it's below 80%.
Actually, if you ignore Litecoin (it's not a really a huge competitor to Bitcoin. It might be "silver" to the "gold", but have 0 chance to overtake bitcoin ofc), the next largest cryptocurrency (bitsharesX) have 0.07% of the market cap of BTC.
Yeah.. there is not really much competition out there right now.